Gardening Columns

Alternatives to Common Invasive Plants

First published on garden.org on April 24 , 2008, by Suzanne
DeJohn

In my last column I raised the issue of invasive plants, and now I'd like
to suggest some noninvasive options for our gardens. Below are some native
ground covers, shrubs, trees, perennials, and vines that are attractive and
well behaved in the landscape. The lists are by no means comprehensive, but
they'll serve to show that there are many alternatives to common invasives
-- what some people call "plant thugs."

The term "invasive" is hard to define, and just because a plant is native doesn't
mean it can't pose problems. The native perennial bee balm (Monarda didyma),
a mint relative, spreads quickly and will overtake most plants in its path. Native
tall phlox (Phlox paniculata), evening primrose (Oenothera spp.),
and queen of the prairie (Filipendula rubra) can vigorously colonize a
garden. All could be termed "native invasives." Most perennials multiply to some
extent; however, nonnative plants often have an advantage because the forces
(pests, temperature extremes, etc.) that keep them in check in their native habitat
are missing here.

Remember that not all plants adapt to all growing environments -- sun or shade,
dry or wet soil, etc. -- so be sure to match plants to your garden situation.
And remember that these plants may take a little longer to get established than
their vigorous (and invasive) alternatives.

Sources of Native, Noninvasive Plants
You may have to look a little harder to find native plants. Each state has a
native plant society, and these are good starting points in the search to find
appropriate plants for your landscape. Below I've included a list of our region's
native plant societies. Another possible source is your state's department of
natural resources. Some states have spring plant sales of native plants, often
for special purposes such as stream bank restoration. Finally, an Internet search
using your state and "native plants" as search terms, should provide some sources,
as well as a wealth of information.